JP4542699B2 - Gas generator for airbag and airbag device - Google Patents

Description

【００５０】
この結果からも明らかなように、連通部（本実施例では伝火孔）の数を多く形成することにより、即ち、隣り合う連通部同士の中心角を小さくすることにより、ガス発生剤の着火性能を向上させることができる。
【００５１】
これにより、衝撃後、迅速にエアバッグを膨張させることのできるエアバッグ用ガス発生器が実現する。
【００５２】
但し、この実施例は、連通部（伝火孔）の形状や配置によるガス発生剤の着火性の向上を確認することを目的とするものである。依って、上記の（１）又は（２）に示すように連通部（伝火孔）の形状や配置が異なっており、それ以外の構成に於いては共通するガス発生器であれば、本実施例と略同様の効果を確認することができる。即ち、本発明の効果を確認する上では、上記の（１）又は（２）で使用するガス発生器で使用されるガス発生剤は、発生ガス量や線燃焼速度が同じであれば何でも良く、またガス発生器もガス発生剤の燃焼に寄与し得る空隙容積が同じであれば同様の効果を確認することができる。
【００５３】
【発明の効果】
本発明は、着火性の劣るガス発生剤であっても使用可能とした構造を有するエアバッグ用ガス発生器であって、更にこのようなガス発生剤であっても、作動初期の段階に於いて十分な作動性能を発揮し得るガス発生器とすることができる。即ち、使用されるガス発生剤の特性（例えば、燃焼性能など）が変わった場合であっても、初期の作動性能、または此に近似する作動性能が得られるガス発生器が実現する。
【００５４】
更に、このような効果を有するエアバッグ用ガス発生器が、簡易な構造によって実現されている。
【図面の簡単な説明】
【図１】 本発明のガス発生器の好ましい実施態様を示す縦断面図
【図２】 図１に示すガス発生器の要部水平断面図
【図３】 本発明のエアバッグ装置を示す略図
【符号の説明】
１ ディフューザシェル
２ クロージャシェル
３ ハウジング
４ 点火器
５ 伝火薬
６ ガス発生剤
７ クーラント・フィルタ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas generator for an air bag that protects an occupant from an impact, and particularly relates to a gas generator for an air bag and an air bag device that are characterized by their operating performance.
[0002]
[Prior art]
In vehicles such as automobiles, when the vehicle collides at high speed, a bag with gas is used to prevent a passenger from crashing into a hard part inside the vehicle such as a handle or a windshield and being injured or dying due to inertia. It is equipped with an air bag system that inflates rapidly and prevents the passenger from colliding with dangerous locations.
[0003]
Such an airbag system can safely protect the occupant even if the physique of the occupant (for example, a person with a high or low seating height, an adult or a child, etc.), or the riding posture (for example, a posture clinging to a handle) is different. It is desirable that it can be restrained. Therefore, conventionally, there has been proposed an airbag system that operates with as little impact as possible to an occupant.
[0004]
Further, regarding the operation of the gas generator, it is necessary to form a cushion between the two immediately before the occupant collides with a structure in the vehicle.
[0005]
Therefore, there is a need for a gas generator that is immediately activated by an actuation signal received from a sensor that has sensed an impact and that quickly generates a sufficient amount of working gas to inflate the airbag.
[0006]
Such a problem has already been solved by many conventional gas generators.
[0007]
However, the gas generators provided in the past are used because they are designed for each gas generating agent used for the gas generator, that is, a composition that actually generates a working gas for inflating an airbag. When the characteristics of the gas generating agent (for example, combustion performance, etc.) changed, sufficient operating performance could not be obtained.
[0008]
[Problems to be solved by the invention]
The present invention provides a gas generator for an air bag having a structure that can be used even with a gas generating agent that is less ignitable than a gas generating agent used in a conventional gas generator. The present invention provides a gas generator capable of exhibiting sufficient operation performance even in the early stage of operation even with such a gas generating agent. Moreover, the airbag apparatus using this gas generator is provided.
[0009]
[Means for Solving the Problems]
An object of the present invention is to provide an ignition means accommodating chamber for accommodating an ignition means inside the inner cylinder member, and a gas generating agent on the outside by arranging a substantially cylindrical inner cylinder member in a housing having a gas discharge port. A gas generator for an air bag in which a combustion chamber is formed, and a plurality of transmission holes for injecting a flame generated by the operation of the ignition means into the first combustion chamber are formed on a peripheral surface of the inner cylindrical member. The heat transfer hole is formed in a range in which the distance from the end of the inner cylinder member is 30 to 70% of the axial length of the inner cylinder member. This is achieved by a gas generator for an air bag.
[0010]
In addition, a plurality of communication portions that allow the ignition means storage chamber and the combustion chamber to communicate with each other are formed on the circumferential surface of the inner cylinder member in the circumferential direction, and the plurality of communication portions are formed between adjacent communication portions. It is also achieved by an air bag gas generator characterized in that the center angle is adjusted to 60 ° or less, preferably 45 ° or less.
[0011]
The inner cylinder member is disposed on the inner side of the housing, and defines an ignition means accommodation chamber on the inner side and a combustion chamber on the outer side. Therefore, it is necessary to provide at least an ignition means accommodation chamber on the inner side of the inner cylinder member, but a combustion chamber (that is, a second combustion chamber) that exists separately from other chambers, for example, the outer side of the inner cylinder member. ) May be provided. The ignition means accommodating chamber is a chamber for accommodating ignition means for starting the operation of the gas generator, and the combustion chamber is a chamber for accommodating gas generating means that is ignited and burned by the activated ignition means. The fire transfer hole is a through hole for ejecting the flame of the ignition means for igniting the gas generating means into the combustion chamber. Moreover, if this inner cylinder member has at least a cylindrical peripheral wall surface, the inner opening member also includes an end opening provided with a flange.
[0012]
As this communication part, it can form in the inner cylinder member by the 1 or 2 or more heat-transfer hole penetrated to the radial direction, for example. That is, for example, when one communication hole is used as a communication part, the communication part and the transmission hole are substantially synonymous, but each penetration part is formed by a plurality of transmission holes. In other words, a so-called fire transfer hole group composed of a plurality of heat transfer holes is formed at the predetermined intervals in the circumferential direction of the inner cylinder member.
[0013]
In particular, when the communication portion is formed with one heat transfer hole, it is desirable that the heat transfer hole has an inner diameter of 1 to 4 mm, preferably 1.8 to 3.2 mm.
[0014]
Furthermore, in the gas generator, the plurality of communicating portions may have a flame or heat mist ejection angle of 60 ° or more left and right about an axis orthogonal to the center of the communicating portion. It is desirable that the angle is adjusted within a horizontal angle range of preferably 90 ° or more.
[0015]
Further, the above problem can be solved by a gas generator in which the internal pressure of the housing becomes maximum 5 to 20 milliseconds after the ignition current is applied when the gas generator is operated. In this case, the surface area of the gas generating agent ignited in 2 milliseconds after applying the ignition current to the igniter is 30 to 90% or more, more preferably 40%, of the surface area of the total gas generating agent accommodated in the initial combustion chamber. It is desirable that it is -60% or more.
[0016]
According to the gas generator of the present invention, the gas generating agent accommodated in the combustion chamber is ignited all at once by the flame of the ignition means ejected from the communicating portion, and combustion can be started. That is, the ignitability of the gas generating agent at the initial stage of starting the gas generator operation can be improved.
[0017]
The operational performance of such a gas generator can also be confirmed by a tank combustion test shown below.
<Tank combustion test>
A gas generator for airbags is fixed in a SUS (stainless steel) tank with an internal volume of 60 liters, and the tank is sealed at room temperature and then connected to an external ignition circuit. Separately, with the pressure transducer installed in the tank, the time when the ignition electric circuit switch was turned on (application of the ignition current) was set to 0, and the pressure increase change in the tank was measured for a time of 0 to 200 milliseconds. Each measurement data is finally converted into a tank pressure / time curve by computer processing to obtain a curve (hereinafter referred to as “tank curve”) for evaluating the operation performance of the gas generator. After the completion of combustion, a part of the gas in the tank can be extracted and used for gas analysis such as CO and NOx.
[0018]
Similarly, with respect to the pressure inside the housing, the ignition current application time is set to 0, and the change in the pressure is measured for a time of 0 to 200 milliseconds to obtain the change over time in the housing internal pressure. Thereby, the time until the internal pressure of the housing becomes maximum, that is, the maximum internal pressure arrival time can be specified.
[0019]
The tank maximum pressure in the present invention is the maximum pressure in the SUS tank in this tank combustion test, and the maximum internal pressure is the maximum pressure in the housing when the gas generator is operated. That is.
[0020]
In the gas generator for an air bag according to the present invention, an inner cylinder member that divides at least the inside of the housing into a combustion chamber and an ignition means accommodation chamber is disposed, and is formed on the circumferential surface of the inner cylinder member in the circumferential direction. In addition, the communication part enabling communication between the two chambers needs to have the central angle between adjacent communication parts adjusted to 60 ° or less, but other configurations such as the composition and shape of the gas generating means, gas generation, etc. The presence or absence of a coolant or a filter for cooling and / or purifying the working gas generated by the combustion of the means, the overall shape of the housing, or the like can be appropriately adjusted according to the operating performance. For example, regarding the gas generating means for generating a working gas by combustion, in addition to inorganic azides that have been widely used in the past, such as azide-based gas generating agents based on sodium azide (sodium azide), non-inorganic azide-based non-inorganic azides An azide-based gas generating agent can also be used. In addition, the size and number of gas discharge ports formed in the housing, the housing size, the overall shape, and the like can be appropriately adjusted according to the operating performance, the accommodation space, and the like.
[0021]
The above-described gas generator for an air bag is accommodated in a module case together with an air bag (bag body) that introduces a gas generated by the gas generator and inflates, thereby forming an air bag device. In this airbag device, the gas generator is operated in conjunction with the impact sensor detecting the impact, and the working gas is discharged from the gas discharge port of the housing. The working gas flows into the air bag, whereby the air bag breaks the module cover and inflates to form a cushion that absorbs an impact between a hard structure in the vehicle and the occupant.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, based on the embodiments shown in the drawings, a housing for a gas generator for an air bag of the present invention and a gas generator for an air bag using the same will be described.
[0023]
FIG. 1 is a schematic longitudinal sectional view showing an embodiment of the gas generator for an air bag of the present invention.
[0024]
The gas generator shown in this figure has an ignition means composed of an electric igniter 6 and a charge transfer agent 7 in a housing 3 having a gas discharge port 11, and an air bag is inflated by the operation of the ignition means. The gas generating means (that is, the gas generating agent 8) for generating the working gas is contained, and further, gas is generated between the combustion chamber 9 in which the gas generating agent 8 is accommodated and the peripheral wall portion of the housing 3. Coolant / filter means (that is, coolant 5) for cooling the working gas generated by the combustion of the agent 8 is provided. A deflector member 18 having a cylindrical portion 19 is disposed at the end of the coolant 5 on the diffuser shell 1 side.
[0025]
The housing 3 is formed by a diffuser shell 1 having a closed cylindrical shape and a closure shell 2 having a bottomed cylindrical shape, and both shells are integrally welded by outward flange portions 53 and 58 formed in respective openings. It has become. Among these, the peripheral wall of the closure shell is formed such that the flange portion 53 side extends radially outward.
[0026]
In this housing, a cylindrical inner cylinder member 4 having a flange portion 24 to be joined to the inner surface of the ceiling portion of the housing is disposed. Room 9 is used. Both chambers are formed so as to communicate with each other by a plurality of communicating portions formed on the peripheral surface of the inner cylinder member 4. In the present embodiment, this communication portion is embodied as a heat transfer hole 14, and each communication portion is constituted by one heat transfer hole 14 having an inner diameter of 1.8 to 3.2 mm. Yes. However, a plurality of heat transfer holes having a smaller diameter than this can be combined (as a heat transfer hole group) to form a communication portion.
[0027]
If the distance (L) from the end of the inner cylinder member 4 is formed within a range in which the length (L1) of the inner cylinder member 4 is 30 to 70% of the axial length (L1) of the inner cylinder member 4, gas is generated. The ignition performance of the agent 8 can be improved. For example, as shown in FIG. 1, when using the inner cylinder member having an axial length (L1) of 29 mm and forming the heat transfer hole 14 at a position 10 mm from the end portion on the diffuser shell side, after applying the ignition current, After approximately 8.2 milliseconds, the internal pressure of the housing becomes maximum. The axial length of the inner cylinder member 4 is based on the state in which the inner cylindrical member 4 is disposed in the gas generator as a rule, but in most cases, no particular difference occurs even if the state before being assembled to the gas generator is used as a reference.
[0028]
The ignition means housing chamber 10 is composed of an igniter 6 that operates upon receipt of an operation signal (that is, an ignition current for operation), and a charge transfer 7 that ignites and burns by the operation of the igniter. Ignition means are housed. The lower end of the igniter 6 constituting the ignition means is fixed by caulking the lower end opening of the inner cylinder member 4, and the transfer charge 7 is disposed immediately above the igniter 6. The combustion chamber 9 contains a gas generating agent 8 that is ignited and burned by the flame of the ignition means (in this embodiment, the flame of the transfer charge 7) and generates a working gas for inflating the airbag. Yes.
[0029]
As shown in the horizontal sectional view of the inner cylinder member 4 in FIG. 2, the heat transfer holes 14 formed in the peripheral surface of the inner cylinder member 4 have a central angle α between adjacent communicating portions of 60 ° or less. Has been adjusted. Thereby, the space | interval of the adjacent heat transfer holes 14 can be made small, and the contact area of the flame of the transfer powder which ejects from this heat transfer hole 14 and the gas generating agent in a combustion chamber can be increased. Accordingly, it is possible to increase the ignition area of the gas generating agent 8 at the initial stage of the operation of the gas generator, thereby improving the ignition performance of the gas generating agent 8. When this communication part is formed by one heat transfer hole 14, for example, the inner cylinder member 4 has 12 heat transfer holes 14 having an inner diameter of 1.85 mm in the circumferential direction (that is, adjacent communication parts are connected to each other). The central transfer angle is 30 °) and the eight heat transfer holes having an inner diameter of 2.2 mm in the circumferential direction (that is, the central angle between adjacent communicating portions is 45 °) and the heat transfer holes 14 having an inner diameter of 2.6 mm are provided. Six pieces can be formed in the circumferential direction (that is, the central angle between adjacent communicating portions is 60 °).
[0030]
In the communication portion formed in this way (fire transfer hole 14 in the present embodiment), when the total area of the communication portion is substantially constant, the gas generating agent becomes smaller as the central angle α between the adjacent communication portions becomes smaller. It is possible to improve the initial ignition performance.
[0031]
Further, the flame and thermal mist of the ignition means (the transfer powder 7 in the present embodiment) ejected from the plurality of communication portions (the transfer hole 14 in the present embodiment) are orthogonal to the transfer hole 14. It is desirable to adjust so that the air is ejected within a range of a horizontal angle β that is 60 ° or more from side to side with respect to L.
[0032]
The inner cylinder member 4 to which the igniter 6 is fixed by caulking the end portion is accommodated in an opening 60 of the closure shell 2 described later, and is welded and integrated with the closure shell 2 in a state where the igniter 6 is fixed. ing. Specifically, a cylindrical portion 61 that bends inside the housing 3 is integrally formed in the opening 60, and the cylindrical portion 61 and the inner cylindrical member 4 are welded. Since the cylindrical part 61 is bent inside the housing 3, only the cylindrical part 61 does not protrude outward in the axial direction of the housing 3, and accordingly, the overall height of the housing 3 itself is suppressed. As a result, the height of the entire gas generator can be suppressed. On the contrary, when the gas generator formed in this way is formed at the same height as the gas generator in which the cylindrical portion 61 is bent outside the housing 3, even if it has the same height and outer diameter, The internal volume of the housing can be made sufficiently large. Further, the cylindrical portion 61 can support the substantially annular under plate 22 that supports the gas generating means.
[0033]
The cylindrical coolant 5 formed using a laminated wire mesh or the like is supported by bent portions formed at the end portions of the shells 1 and 2 and is disposed so as to be substantially paired with the inner peripheral surface of the housing, and A gap 20 is formed between the outer peripheral surface of the coolant 5 and the inner peripheral surface of the housing 3 as a working gas flow path. By this gap 20, the coolant 5 can function entirely and effectively.
[0034]
As the coolant 5, a coolant that does not bulge outward in the radial direction due to the pressure of the working gas is preferably used. This is because, if the coolant 5 swells due to the passage of the gas generating means, the gap 20 secured between the coolant 5 and the inner peripheral surface of the housing is closed, so that it cannot effectively function as a gas flow path. Because. Therefore, the coolant 5 shown in this embodiment has a tensile strength in the radial direction of 12054N (1230 kgf).
[0035]
A deflector member 18 is disposed between the end surface of the coolant 5 and the inner surface of the diffuser shell 1. The deflector member 18 is useful when a gas generating agent 8 that generates a fluid or semi-fluid combustion product by combustion is used.
[0036]
That is, the combustion products generated by the combustion of the gas generating agent can be removed by adhering to the cylindrical portion 19 of the deflector member 18 or dropping it after collision. Further, in the deflector member 18, the annular portion 16 that comes into contact with the end surface of the coolant 5 is formed to have elasticity as appropriate, so that the coolant 5 disposed on the radially outer side of the combustion chamber 9 is axially disposed. It is also possible to use a metal mesh coolant 5 with less expansion and contraction. Further, the deflector member 18 is integrally formed with the annular portion 16 with a wall portion 17 in contact with the inner peripheral surface of the coolant 5. Thereby, the positioning and fixing of the coolant 5 and the so-called short path in which the working gas is discharged without passing through the coolant can be prevented.
[0037]
In the gas generator formed as described above, the transfer charge 7 is ignited and burned by the igniter 6 which is operated by applying an ignition current for operation, and the flame is transferred to the transfer hole of the inner cylinder member 4. 14, and is released into the accommodating space of the gas generating agent 8. The flame of the charge transfer agent 7 ignites and burns the gas generating agent 8, but even when a part of the flame transfer agent 7 passes directly through the coolant 5, it hits the cylindrical portion 19 of the deflector member 18 and remains as it is. The situation of ejecting from the discharge port 11 can be prevented. The working gas generated from the gas generating agent 8 ignited by the flame of the transfer powder 7 passes through the coolant 5 and reaches the gap 20 secured between the outer peripheral surface of the coolant 5 and the inner peripheral surface of the housing 3. . When the working gas that has passed through the coolant 5 contains a fluid or semi-fluid combustion product, it collides with and adheres to the cylindrical portion 19 of the deflector member 18 disposed in the gap 20, It will be removed from the working gas.
[0038]
In FIG. 1, the gas discharge port 11 and the heat transfer hole 14 are respectively closed by a seal tape 15, and the gas generating agent 8 is supported by the under plate 22 and accommodated in the combustion chamber. Moreover, the member described as the deflector member 18 in this Embodiment can function also as a mist collection member or a flame-proof board by the same structure.
“Embodiment 2”
FIG. 3 shows an embodiment of the airbag apparatus of the present invention configured to include a gas generator using an electric ignition type ignition means.
[0039]
The airbag device includes a gas generator 200, an impact sensor 201, a control unit 202, a module case 203, and an airbag 204. As the gas generator 200, the gas generator described with reference to FIG. 1 is used, and its operation performance is adjusted so as not to give a shock to the occupant as much as possible in the initial stage of the gas generator operation. ing.
[0040]
The impact sensor 201 can be composed of, for example, a semiconductor acceleration sensor. In this semiconductor type acceleration sensor, four semiconductor strain gauges are formed on a beam of a silicon substrate which is bent when acceleration is applied, and these semiconductor strain gauges are bridge-connected. When acceleration is applied, the beam bends and the surface is distorted. Due to this strain, the resistance of the semiconductor strain gauge changes, and the change in resistance is detected as a voltage signal proportional to the acceleration.
[0041]
The control unit 202 includes an ignition determination circuit, and a signal from the semiconductor acceleration sensor is input to the ignition determination circuit. When the impact signal from the sensor 201 exceeds a certain value, the control unit 202 starts computation, and when the computed result exceeds a certain value, the igniter 6 of the gas generator 200 receives an activation signal (that is, activation signal). Output ignition current).
[0042]
The module case 203 is made of polyurethane, for example, and includes a module cover 205. The airbag 204 and the gas generator 200 are accommodated in the module case 203 and configured as a pad module. This pad module is usually attached to the steering wheel 207 when attached to the driver's seat side of the automobile.
[0043]
The airbag 204 is made of nylon (for example, nylon 66) or polyester, and the bag mouth 206 surrounds the gas discharge port of the gas generator and is fixed to the flange portion of the gas generator in a folded state. .
[0044]
When the semiconductor acceleration sensor 201 detects an impact at the time of a car collision, the signal is sent to the control unit 202, and when the impact signal from the sensor exceeds a certain value, the control unit 202 starts calculation. When the calculated result exceeds a certain value, an operation signal is output to the igniter 6 of the gas generator 200. As a result, the igniter 6 operates to ignite the gas generating agent, and the gas generating agent burns to generate gas. This gas is ejected into the air bag 204, whereby the air bag breaks the module cover 205 and inflates to form a cushion that absorbs impact between the steering wheel 207 and the occupant.
[0045]
【Example】
A tank combustion test was performed using the gas generator shown in FIG. 1, and the time until the internal pressure of the housing reached the maximum after the ignition current was applied (hereinafter also referred to as the housing maximum internal pressure arrival time) was measured.
[0046]
However, a heat transfer hole shown in the following (1) or (2) was formed in the inner cylinder member that divides the ignition means accommodating chamber and the combustion chamber as a communicating portion that allows the two chambers to communicate with each other. The results are shown in Table 1.
[0047]
The details of the gas generator used in this example will be omitted with reference to the above embodiment.
(1) Gas in which eight communicating portions formed of a heat transfer hole (enhancer nozzle) having an inner diameter of 2.2 mm are formed in the circumferential direction of the inner cylinder member (that is, the central angle between adjacent communicating portions is 45 °). Generator.
(2) Gas in which twelve communicating portions (i.e., the central angle between the adjacent communicating portions is set to 30 °) in the circumferential direction of the inner cylinder member are formed of a heat transfer hole (enhancer nozzle) having an inner diameter of 1.85 mm. Generator.
[0048]
Table 1 shows the housing maximum internal pressure arrival time obtained by using the gas generator shown in (1) or (2).
[0049]
[Table 1]

[0050]
As is apparent from this result, the ignition of the gas generating agent is achieved by forming a large number of communicating portions (in this embodiment, the heat transfer holes), that is, by reducing the central angle between the adjacent communicating portions. Performance can be improved.
[0051]
Thereby, the gas generator for airbags which can inflate an airbag rapidly after an impact is realized.
[0052]
However, the purpose of this embodiment is to confirm improvement in the ignitability of the gas generating agent due to the shape and arrangement of the communication portion (fire hole). Therefore, as shown in the above (1) or (2), the shape and arrangement of the communication part (fire transfer hole) are different. The effect substantially the same as an Example can be confirmed. That is, in order to confirm the effect of the present invention, the gas generating agent used in the gas generator used in the above (1) or (2) may be anything as long as the amount of generated gas and the linear combustion rate are the same. The same effect can be confirmed if the gas generator has the same void volume that can contribute to the combustion of the gas generating agent.
[0053]
【The invention's effect】
The present invention provides a gas generator for an air bag having a structure that can be used even with a gas generating agent having poor ignitability. Further, even if such a gas generating agent is used, the gas generating agent is in an early stage of operation. And a gas generator capable of exhibiting sufficient operating performance. That is, even when the characteristics (for example, combustion performance) of the gas generating agent used are changed, a gas generator capable of obtaining an initial operating performance or an operating performance close to this is realized.
[0054]
Furthermore, an air bag gas generator having such an effect is realized by a simple structure.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a preferred embodiment of a gas generator of the present invention. FIG. 2 is a horizontal sectional view of a main part of the gas generator shown in FIG. 1. FIG. 3 is a schematic view showing an airbag apparatus of the present invention. Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Diffuser shell 2 Closure shell 3 Housing 4 Igniter 5 Transfer charge 6 Gas generating agent 7 Coolant filter

Claims (5)

Covered cylindrical diffuser shell having a gas discharge port and bottomed cylindrical closure shell are integrated with the opening and integrated into the housing to provide a working gas flow path between the peripheral wall of the housing. A cylindrical coolant is arranged to form a gap,
An air in which a substantially cylindrical inner cylinder member is arranged inside a cylindrical coolant, an ignition means accommodation chamber for accommodating ignition means inside the inner cylinder member, and a combustion chamber for accommodating a gas generating agent outside. A gas generator for a bag,
On the peripheral surface of the inner cylinder member, a plurality of heat transfer holes for ejecting a flame generated by the operation of the ignition means into the combustion chamber are formed at equal intervals .
The plurality of heat transfer holes have an inner diameter of 1.8 to 3.2 mm, and a central angle α formed by a line connecting the central axes of the adjacent heat transfer holes to the center of the inner cylinder member is 30 ° to 60 °. Is adjusted to be
The heat transfer hole is formed within a range in which the distance from the end of the inner cylinder member on the diffuser shell lid side is 30 to 70% of the axial length of the inner cylinder member,
Furthermore, the deflector member is arrange | positioned in the position facing the gas exhaust port between a gas exhaust port and a cylindrical coolant, The gas generator for airbags characterized by the above-mentioned. The plurality of heat transfer holes are adjusted so that a central angle α formed by a line connecting the center axes of adjacent heat transfer holes with the center of the inner cylinder member is 30 to 45 ° ,
The plurality of heat transfer holes are formed in a range in which a distance from an end of the inner cylinder member on the diffuser shell lid side is 40 to 60% of an axial length of the inner cylinder member. The gas generator for airbags as described.   3. The gas generator for an air bag according to claim 1, wherein an igniter that operates when an ignition current for operation is applied is accommodated on a bottom side of the inner shell of the inner shell member. The ignition means accommodating chamber contains ignition means configured to include an igniter that operates by applying an ignition current, while the combustion chamber is ignited and burned by the operation of the ignition means. Contains a gas generating agent that generates gas,
The gas generator for an air bag according to any one of claims 1 to 3, wherein the internal pressure of the housing becomes maximum 5 to 20 milliseconds after the ignition current is applied. A gas generator for an air bag;
An impact sensor that senses impact and activates the gas generator;
An airbag that inflates by introducing gas generated by the gas generator;
An air bag apparatus comprising: a module case for housing the air bag, wherein the gas generator for the air bag is a gas generator for an air bag according to any one of claims 1 to 4.

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